import java.util.*;
public class Example3_9{
   public static void main (String args[]){
      Scanner reader = new Scanner(System.in);
      double sum = 0;
      int m=0;
      while (reader.hasNextDouble()){
             double x = reader.nextDouble();
             m = m+1;
             sum=sum+x;
      }
     System.out.printf("%d的和为%f",m,sum);
     System.out.printf("%d的个数的平均值是%f\n",m,sum/m);
   }
}
